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| C4 Technical and Performance For technical and performance related discussion of 1984 - 1996 Corvettes. |
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05-21-05, 06:35 PM
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#1 (permalink)
| | Member 
Join Date: Jan 2004 Location: chicago, Il
Posts: 78
My Corvette(s):
1994, artic white, zo7, coupe, with a six speed. |  Black smoke from tail pipes.
One of my Vette comrads owns a 96 coupe with the automatic trans. The car is bone stock, mileage unknown, but I was driving behind it today and from time to time, puffs of black smoke would come from the tail pipes. I figures that it might be a problem with the optispark. Does anyone know of this problem and what is the cure? Thanks for the information.  | |
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05-21-05, 06:36 PM
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#2 (permalink)
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Join Date: May 2003 Location: Mission Viejo, CA
Posts: 218
My Corvette(s):
1991 Turquoise Metallic Coupe |
Sounds like the engine's burning oil.
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05-21-05, 06:40 PM
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#3 (permalink)
| | Member
Join Date: Jan 2004 Location: chicago, Il
Posts: 78
My Corvette(s):
1994, artic white, zo7, coupe, with a six speed. | Black smoke from tail pipes
Quote: |
Originally Posted by Rogue Sounds like the engine's burning oil. |
Oil burning is blue in color, I thought black was a rich fuel condition?
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05-21-05, 06:43 PM
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#4 (permalink)
| | Moderator
Join Date: Jan 2004 Location: Northern Indiana
Posts: 3,264
My Corvette(s):
1987 Z52 Black Convertible |
When would it puff? Was it when he was flooring it?
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05-21-05, 08:23 PM
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#5 (permalink)
| | Supporting Member
Join Date: May 2002 Location: 5th Wheeling & Lebanon, MO
Posts: 6,389
My Corvette(s):
Millennium Yellow Y2K/MN6/Z51/LS6 Roadster |
Sounds like someone needs to open that baby up  just a bit more often. 
Later . . . . . .
6 Shooter
Last edited by 6 Shooter; 05-22-05 at 08:22 AM.
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05-21-05, 08:55 PM
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#6 (permalink)
| | Moderator
Join Date: Jan 2004 Location: Northern Indiana
Posts: 3,264
My Corvette(s):
1987 Z52 Black Convertible |
Quote: |
Originally Posted by 6 Shooter Sounds like someone needs to open that baby up just a bit more ofter.
Later . . . . . .
6 Shooter | That are my feelings as well.
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05-22-05, 04:29 PM
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#7 (permalink)
| | Member
Join Date: Jan 2004 Location: chicago, Il
Posts: 78
My Corvette(s):
1994, artic white, zo7, coupe, with a six speed. |
Quote: |
Originally Posted by Vettefan87 When would it puff? Was it when he was flooring it? |
While I was behind it there would be two to three puffs at a time. The car was cruising at about 60-70 miles per hour. I thought it might be a sign of incomplete combustion through some problem in the ignition system.
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05-23-05, 05:39 PM
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#8 (permalink)
| | Member
Join Date: May 2003 Location: Mission Viejo, CA
Posts: 218
My Corvette(s):
1991 Turquoise Metallic Coupe |
Quote: |
Originally Posted by ohsobad Oil burning is blue in color, I thought black was a rich fuel condition? | Not trying to be a smart ass.
I've never seen blue smoke. Blue flame yes. But blue smoke? Just wondering.
Can you smell burned oil from the exhaust? Does it creat lots of soot around the muffler tips and bodywork near the muffler tips?
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05-23-05, 05:45 PM
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#9 (permalink)
| | Member
Join Date: Sep 2003 Location: Ingleside, IL
Posts: 1,894
My Corvette(s):
1974 454 Coupe / 1998 Trans Am both modded |
Quote: |
Originally Posted by Rogue Not trying to be a smart ass.
I've never seen blue smoke. Blue flame yes. But blue smoke? Just wondering.
Can you smell burned oil from the exhaust? Does it creat lots of soot around the muffler tips and bodywork near the muffler tips? | Yep! Oil burn smoke is gray with a blue tint to it. Very different from black sooty smoke (related to poor combustion). It (Burning Oil) usually smells like a burnt piece of $#&^!!
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05-23-05, 05:50 PM
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#10 (permalink)
| | Member
Join Date: May 2003 Location: Mission Viejo, CA
Posts: 218
My Corvette(s):
1991 Turquoise Metallic Coupe |
Got it.
Occassionally, I'll see a hint of greyish exhaust in some vehicles, then smell the burnt crap afterwards! Thanks for the education.
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05-23-05, 08:44 PM
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#11 (permalink)
| | Member
Join Date: Aug 2004 Location: Greenfield, IN
Posts: 946
My Corvette(s):
1993 Black & Silver LT1 A4 Coupe |
I get that black puff sometimes when I mash the pedal. It is unburnt fuel from too rich mixture. I suppose I should replace the TPS to see if that cures it. I've read (probably on here) that when the TPS gets old, it tends to send the computer incorrect readings. That can cause lean or rich mixture.
__________________  Tom Merrick --iya AMMO yas-- ---------------------- '93 Corvette Coupe - LT1 A4, Black & Silver, 13.76 et @ 113mph (K&N and Power Effects Exhaust) Flashback Arcade - My 80's arcade gameroom
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-- President Ronald Reagan 8/23/84 May God bless our soldiers and keep them safe.  | |
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05-25-05, 01:37 AM
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#12 (permalink)
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Posts: n/a
My Corvette(s):
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Quote: |
Originally Posted by ohsobad One of my Vette comrads owns a 96 coupe with the automatic trans. The car is bone stock, mileage unknown, but I was driving behind it today and from time to time, puffs of black smoke would come from the tail pipes. I figures that it might be a problem with the optispark. Does anyone know of this problem and what is the cure? Thanks for the information. | Had a similar problem with my '95 and it was because of some bad injectors. Mine was a little worse. however. It would flood everytime when I went to start it and I would have to do a "clear flood" to get it to start which really brought out the black smoke until it was running, and then it would send out black puffs of smoke while underway. All caused by unburned fuel. Replaced all injectors and now runs like it's supposed to.
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05-25-05, 07:51 AM
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#13 (permalink)
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Join Date: Jul 2001 Location: Middleboro, MA
Posts: 1,470
My Corvette(s):
99' MR Coupe, 04' Silverado 03' ZO6 Sold |
Any codes? Could be an O2 sensor on its way out.
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05-25-05, 08:32 AM
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#14 (permalink)
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Join Date: Oct 2002 Location: Downers Grove, IL
Posts: 732
My Corvette(s):
1995 AdmiralBlue LT4/A4 |
I would check to make sure the fuel pressure regulator is not damaged by pulling off the vaccum line to it and checkingfor fuel. something easy to do. I would say to do a fuel system cleaning to clean the injectors and decarbonize the engine.
You could have other issues such as stated before an 02 sensor. Any codes?
-=Rick
__________________
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Owner / Rick Anthony Motorsports
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05-25-05, 08:39 AM
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#15 (permalink)
| | Supporting Member
Join Date: Sep 2002 Location: Richmond, VA
Posts: 1,529
My Corvette(s):
1991 Red Conv. |
I would run some Seafoam injector cleaner in a fresh tank of gas and then see how it does. Just my $.02.
Randy
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